No bugs whatsoever so far and I've had it for a month now. It's working really well and the upscaling to 4K is pretty good too. I haven't tried letting my 4K tv do the upscaling yet as I've been happy with the picture quality so far. The box is very fast and scrolling through the guide and switching channels is much quicker than the older boxes and a bit quicker than the X8. It just really turned out great for me to be able to purchase it at $300.